Comparison of the postoperative analgesic effect for infiltration between the popliteal artery and the capsule of the posterior knee and that of periarticular multimodal drug injection in total knee arthroplasty: retrospective study in the immediate postoperative period - Jung, D W; Shon, W Y; Seo, S S; Kim, O G; Lee, I S (Knee Surg Relat Res, 2020)